If the rainwater that is captured and used for flush fixtures meets the percentile thresholds can this credit be successfully attemtped? If the rainwater is used for the flush fixtures it would not appear to meet the "best replicating natural site hydrology processes" requirement.
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Gustavo De las Heras Izquierdo
LEED Expert184 thumbs up
August 5, 2021 - 6:04 pm
Hi Allen,
You don't need to compare the percentile event with the volume of water required for flushing. The reviewers haven't asked for this calculation so far.
I hope this helps,
Allen Cornett
Sustainable ConsultantINSPEC Sustainability Group LLC
49 thumbs up
August 6, 2021 - 9:11 am
Thank you for the information, but my question might not have been worded corrctly. Basically the project will be collecting every drop of water it can on the roof and at grade so it can be used for the flush fixtures. If 100% of the rainwater is used for flush fixtures I would not think that meets the "best replicating natural site hydrology processes" requirement. Are your thoughts different? Thank you for your time.
Cecile de Villemeur
2 thumbs up
August 6, 2021 - 10:00 pm
I would say that the question is : where does the water enventually finish? if it becomes black water, it will end into the network, so it doesn't replicate natural hydrology process
Gustavo De las Heras Izquierdo
LEED Expert184 thumbs up
August 8, 2021 - 5:32 pm
Hi Allen, I have never had a review comment saying that collecting rainwater doesn't contribute towards credit compliance. Nevertheless, let us know if you finally get the credit awarded.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
February 14, 2022 - 3:17 am
Hi Allen, I got your point. In my opinion, the water collected is diverted from the stomwater system, and thus "retained".
Maria Porter
Sustainability specialistSkanska Sweden
270 thumbs up
February 14, 2022 - 3:26 am
This is a LEED Coach response from 2020. The project (not mine) earned credit for flushing toilets with rainwater. I think this relates to your initial question.
"Yes, on-site capture and re-use of rainwater is an acceptable strategy. As you mentioned in your inquiry, the definition of 'green infrastructure' (GI) specifically mentions capture and reuse. Additionally, within the Step-by-Step Guidance, Option 1, Step 7 specifically calls out rainwater harvesting as a GI strategy that could help a project meet credit requirements.
It should be noted that while captured rainwater may be used towards both irrigation and flushing toilets as a Rainwater Management strategy, and rainwater may help contribute towards earning the Outdoor Water Use Reduction and Indoor Water Use Reduction credits, rainwater cannot be used to help contribute towards earning the Outdoor Water Use Reduction and Indoor Water Use Reduction prerequisites."
Alexander Postnov
August 1, 2024 - 4:40 am
Hi all, I cannot understand how rainwater gathered in a tank and used further for flushing fixtures can "mimic natural hydrologic function". It becomes domestic sewage and leaves the site, the same with stormwater sewerage. I had such review comments already several times, the credit wasn't awarded if any sewerage system is used for rainwater removal from the site. The meaning of "reuse" word in this case should be clarified more precisely: rainwater may be reused on site only. What do you think?